BBC News By Adam Hart 3/26/13
Listen to BBC Radio Broadcast: On the Trail of the American Honeybee
If you're eating a Bakewell slice or a macaroon as you're reading this, then there is a very good chance that you are sampling a little piece of Californian sun.
Whether ground, flaked or toasted, almonds play an important part in our cuisine and a staggering 85% of the world's almonds are grown in the Central Valley; the 450-mile-long, 40- to 60-mile-wide flat-bottomed valley that dominates mid-California.
To get to your kitchen, those almonds have been involved in the biggest single pollination event on Earth.
Californian almond pollination requires billions of honeybees travelling thousands of miles in a nationally coordinated migration operating on a scale that is almost unimaginable to most beekeepers in the UK.
This week, BBC Radio 4 is On the Trail of the American Honeybee - the story of migratory beekeeping, and a story that touches on some of the most controversial - and disturbing - aspects of modern agriculture.